What is the test for admitting relevant evidence in a criminal case?

"The admission of relevant evidence will not offend due process unless the evidence is so prejudicial as to render the defendant's trial fundamentally unfair." (People v. Falsetta (1999) 21 Cal.4th 903, 913, citing Estelle v. McGuire (1991) 502 U.S. 62, 70.) The court's rulings denying severance of the gang-participation charge and bifurcation of the special-circumstance gang allegation and the gang-benefit allegation did not render the trial fundamentally unfair.